During pre-Monsoon season whenever there is an increase in moisture in the atmosphere, local cloud development leads to spot rain in the late afternoon and evening hours.
Reason for such subdued rainfall activities over East India is the cyclonic circulation over westcentral Bay of Bengal off Andhra Coast. Winds are converging around this weather system and thus, moisture feed remains cut off over East and Northeastern states.
But now, we expect a significant increase in the rainfall activities over Bihar, Sub-Himalayan West Bengal, Sikkim and parts of Northeast India.
We have already seen very good showers during last 24 hours in Jalpaiguri to the tune of 51 mm. North Lakhimpur in Assam also received 44.3 mm of rainfall.
This weather system will move towards Telangana and gradually fade away. Thereafter, moisture-laden winds will once again start reaching eastern parts of the country. We can also expect a cyclonic circulation to develop over Bihar and adjoining West Bengal during the next 24 to 48 hours. Moderate to heavy showers are likely over eastern parts of Bihar, Sub-Himalayan West Bengal, Sikkim and Assam.
Monsoon normally covers Northeast India by second week of June. This year as well we can expect timely onset of Southwest Monsoon in Northeast India.
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